Dominique obespik de la



(No Model.) 7

11.0. DE LA JEANNIERE.

AUTOMATIC SAFETY BRAKE FOE ELEVATORS AND HOISTS. v

No. 311,649. A Patented Feb. 3, 1885.

l Q E \Q Q WITNESSES: J INT/ZNTOR: V e A a r w By his .flttorneys,

Usirrs rnrns Aren't rrrcn.

DOMINIQUE CRESPIN DE LA JEANNIERE, OF PARIS, FRANCE.

AUTOMATIC SAFETY-BRAKE FOR ELEVATORS AND HOISTS.

SPECIFICATION forming part of Letters Patent No. 311,649, dated February3, 1885.

Application filed September 20, 1884. (No model.) Patented in BelgiumAugust 23, 1884, No. 66,1l0. and in Italy September 1, 1884,

T0 at whom it may concern:

Be it known that I, DOMINIQUE (JREsPIN on LA JEANNIERE, a citizen of theFrench Re public, and a resident of Paris, France, have invented certainImprovements in Automatic Safety-Brakes, of which the following is aspecification.

My invention relates to an automatic safetybrake especially designed forelevators and hoists, but which is also applicable to automaticallyarresting any rectilinear movement of a car or body, whether itsdirection he horizontal, inclined, or vertical. It belongs to that classof automatic brakes wherein the resistance to the movement by the car orother object to be moved serves to hold the brake freed or out ofengagement; but if the pulling strain be thrown off or relaxed, as bythe breaking of the draft-rope, a spring sets the brake.

My invention consists in the mechanism and arrangement of parts wherebythe automatic braking is effected, and this mechanism comprisesbrakejaws adapted to clamp on a stationary guide-rod or brakerod, ahdspecial means for operating said jaws when the draftrope breaks, all aswill be particularly described hereinafter.

In the drawings, which serve to illustrate my invention, I have shown itas applied to an elevator or hoist, this being sufficient to illustrateits application to cars on inclined or horizontal tracks as well.

Figures 1 and 2 illustrate my invention in its preferred form, theformer being a front and the latter a bottom view or plan. Figs. 3 and 4illustrate a modification, the former being a front elevation, partlybroken away,

and the latter a bottom view or plan, also partly broken away.

Referring first to Figs. 1 and 2, A represents an elevatorcar arrangedin any ordinary elevator-shaftrepresented by B, for example-and providedwith ahoisting-rope, (J. D D are ordinary stationary-guide-rods,whichserve to guide the carin its reciprocating movement, and also serve asbrake-rods, or rods on which the brake-jaws clamp. The hoistingrope O isnot attached directly to the car A, but to a frame, E, comprising across bar or tie, a, which connects two side rods, 1) b, which XXXIv,2-11.

gnide'rod to move freely between them. faces of the jaws may beroughened, if de play in keepers c on the sides of the car, and

are provided at their lower ends with brackets d d, on which rests across beam or sill, 6. These parts form the hoisting-frame E. The car Arests on a spring or springs, f, which are interposed between its bottomand the beam or sill c.

On the car A are bearing-brackets g 9, two at each side, in which aremounted rotatively shafts h h, each of which has right and leftscrewthreads formed on it, which engage female screws in two brake-jaws,i i. These jaws are in the nature of bars that extend across under thecar above beam 6, and their clamping ends embrace the two guide-rods DD, as clearly shown. On the screw-shafts h are fixed pinionsjj, one oneach shaft, and on the side rods, Z), of frame E are formed or securedracksk 70, which mesh with said pinions.

The operation is as follows: When the car is suspended properly,itsweight serves to co mpress the springs f. This compression causes thecar to descend a little in frame E, and, carrying pinionsj with it, tocause their partial rotation by reason of their engagement with racksIt. The partial rotation of the screw-shafts it produced by thisseparates the jaws i of the brake far enough for them to stand clear ofthe guide-rods, or at least not to clamp on said rods, while at the sametime they serve to guide the car on said rods.

The above-described condition is the normal one when the car issuspended from the hoisting -rope;butin case the said rope should break,then the springs f would be relieved of tension and would force down thesuspendingframe E, and with it the racks 70. These would act to rotatethe pinions j and screw-shafts h, and these would cause theclamp-jawsito forcibly clamp the guide rods and arrest the descentof thecar. The movement of the brake-jaws need not be great, as it is onlydesigned that they shall separate far enough to permit the The sired.The modification in Figs. 3 and 4 shows substantially the sameconstruction, differing only in this, that a lever-nut takes the placeof the rack and pinion device. The screw-shafts h are fixed in bracketsg,secured to the bottom of the car. The brake-jawsi are in the form oflever-nuts the fulcrunis being on the guide-rods.

In the form illustrated in Figs. 1 and 2 the brake-jaws move up to theguide-rod in parallel planes or like the jaws of a parallel vise.

In Figs. 3 and'et the fulcrum-axis of the jaws is the same as in Figs. 1and 2; but the jaws are not parallel in fact, but nearly so. In both,the brake-jaws serve to guide the car in its movement normally, and incase of the accidental breaking oft he hoisting-rope the brakejaws actfrictionally and do not stop the car suddenly, as does the well knownsafety ratchet device. The power of the brake is of course dependent onthe tension of springf; but a comparatively lght spring will serve, asits power is multiplied by the screw and rack and pinion.

I am aware that friction safety-brakes have beforebeen proposed forelevators, and that such have been constructed to besetby a spring whenthe hoisting-rope breaks. Therefore I do not claim this, broadly.

I. am also aware that screws have been used or proposed to be used forsetting friction safety-brakes on elevators, said screws being adaptedto be rotated so as to set the brakes by means of the resistance offeredby the rapid upward movement ofa packed weight in a shaft when the cardescends with unusual velocity. This device may operate to set thebrakes when the hoisting'rope is under full tension and unbroken.

In my brake the speed with which the car descends does not control theoperation of the brake, and the latter is set instantly when thehoisting-rope is severed.

In the device just referred to the rapid descent of the car is necessaryto the operation of the brake.

Having thus described my invention, I clai1n 1. The combination, with acar, A, its hoisting-frame E, hoisting-rope O, and springsf, of

the screw-shafts 72, provided with rightand left screw-threads, t'hebrake-jaws i. mounted on said shafts, as described, and the meansdescribed for causing the jaws to clamp on the guide-rods when theweight of the car is taken off the springf, as set forth.

2. The combination, with a car, A, its hoisting-frame E, hoisting-ropeC, and springs f, of the screw-shafts h, mounted in rotative bearings onthe car and provided with right and left screws, the pinions fixed onsaid screwshafts, the racks on the hoisting-frame, and the brake jawsprovided with female screws and mounted on thescrew-shafts,substantially as shown and described.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

DOMINIQUE ORESPIN DE LA J'EANNIERE.

Witnesses:

R0131. M. HOOPER, GEORGES OHAPUIs.

